The two have known each other since they were teens but sparked romance rumors in late 2014. They dated on and off and were even rumored to be engaged in 2015, following a bogus news report.
Their romance sizzled over the 2016 New Year's holiday, when they vacationed in the Caribbean. Weeks later, they spent Super Bowl 50 Weekend together.
During the next two years, the two spent time apart dating other people; Last fall, Justin rekindled his relationship with Selena Gomez for a while, while Hailey and Shawn Mendes sparked romance rumors.
Justin and Hailey reignited their own flame last month, and have since traveled together to places like Miami and New York City, where he proposed to her this weekend.